Reporting Period: September 7–12, 2026
Mexico’s tax, customs and regulatory landscape experienced several significant developments this week, including the submission of the 2027 Economic Package, substantial proposed changes to the Federal Tax Code, new SAT enforcement mechanisms involving artificial intelligence, updates to the 2026 Miscellaneous Tax Rules, and important developments affecting customs, labor, social security and tax litigation.
The week also brought relevant developments for multinational organizations, particularly regarding CFDI cancellation processes, supplier due diligence, tax enforcement, customs compliance, beneficial ownership documentation, deferred tax accounting, and social security obligations.
This report provides an executive overview of the most relevant developments for tax, customs and compliance professionals.
Weekly Agenda
Key Developments During a High-Impact Regulatory Period
2027 Economic Package
Submission to the Chamber of Deputies, including the 2027 Tax Miscellaneous Package, the proposed legal framework for AI-driven tax enforcement, and a preferential capital repatriation regime.
2026 Miscellaneous Tax Rules — 11th Advance Version
New income tax rules applicable to foreign players participating in the 2026 FIFA World Cup, together with an updated IEPS diesel tax incentive.
Customs & Economic Affairs
ANAM guidance regarding commercial NOM compliance, the new Regulation of the Quality Infrastructure Law, and the Vulcan Materials–Mexico ICSID arbitration award.
Employment, Social Security & Courts
Record levels of formal employment, a simplified REPSE process, mandatory digital Employer Identification Cards (TIP) through IMSS, and significant Supreme Court and labor jurisprudence developments.
PRODECON, ABM & IMCP
PRODECON’s 15-year evolution toward PRODECON 4.0, a financial malware alert issued by the banking sector, and key accounting implications of the 2027 Economic Package.
Macroeconomic Pillars of the 2027 Economic Package
Economic Growth
Economic growth of between 1.5% and 2.5% is projected for 2027, supported by domestic consumption, public investment and external-sector activity.
Record Tax Revenues
Tax revenues are projected to reach 15.9% of GDP, representing a historic high without the introduction of new structural taxes. The increase is expected to result primarily from improved collection efficiency and intensified efforts to combat tax evasion.
Deficit Reduction
The Public Sector Borrowing Requirements (RFSP) are expected to decline from 4.1% to 3.9% of GDP, representing a cumulative reduction of 1.8 percentage points compared with 2024.
Public and Mixed Investment
Between 2026 and 2030, approximately MXN 5.7 trillion is projected to be invested in infrastructure, including energy, water, transportation and financing initiatives.
15.9% of GDP in Tax Revenues
Projected historic high for 2027.
3.9% of GDP in RFSP
Reduction of 1.8 percentage points compared with 2024.
MXN 5.7 Trillion — 2026–2030
Projected public and mixed investment.
2027 Tax Miscellaneous Package: Three Immediate Action Areas
The proposed 2027 Tax Miscellaneous Package warrants immediate review by corporate tax and compliance teams. The legislative timetable currently contemplates approval by the Chamber of Deputies on October 20 and by the Senate on October 31, with the proposed provisions becoming effective on January 1, 2027.
🔴 CFDI Cancellation Limited to the Month of Issuance
The proposal would establish that CFDIs may only be cancelled during the same month in which they are issued, subject to exceptions to be established under the 2027 Miscellaneous Tax Rules.
For organizations processing significant invoice volumes, this represents a major operational change compared with the current framework and warrants an immediate assessment of invoicing, cancellation and approval workflows.
🟠 AI Expressly Codified as a SAT Enforcement Authority
Artificial intelligence, which is already being used as part of the 2026 Tax Enforcement Master Plan, would be expressly incorporated into the legal framework.
This would strengthen the legal basis for tax authority actions supported by algorithmic analysis and could make challenges to such actions through constitutional proceedings more difficult.
🟡 7.5% Capital Repatriation Regime
A preferential 7.5% tax rate is proposed for the repatriation of funds held abroad as of September 8, 2026, subject to investment in Mexico and a minimum holding period.
The relevant opportunity window is currently closed, making specialized tax advice essential for assessing whether any alternative mechanism or future opportunity may apply.
Enhanced Enforcement Against EFOS
The proposed amendments would further intensify enforcement against Companies Issuing Simulated Tax Invoices (EFOS) by expanding Article 49 Bis to additional cases involving joint and several liability and introducing new real-time verification powers.
CHAPTER 1 — SHCP
2027 Economic Package: Mexico’s Fiscal Roadmap for the Coming Year
On September 8, 2026, the Ministry of Finance and Public Credit (SHCP) formally submitted the 2027 Economic Package to Congress, meeting the constitutional deadline.
The package includes:
- The 2027 Federal Expenditure Budget Proposal (PPEF 2027);
- The 2027 Federal Revenue Law (LIF 2027); and
- The 2027 Tax Miscellaneous Package.
This is undoubtedly the most significant tax policy event of the year for the Mexican business and professional tax community.
Key Takeaway
The proposal does not introduce new structural taxes. However, it represents a significant strengthening of the SAT’s tax enforcement powers, particularly through the use of artificial intelligence, enhanced data analytics and proposed amendments to the Federal Tax Code (CFF).
For multinational organizations, the direction of travel is clear: greater reliance on technology, data integration and real-time enforcement capabilities.
CHAPTER 2 — SAT / RMF
11th Advance Version of the Second 2026 Miscellaneous Tax Rules
On September 10, 2026, SAT published the 11th Advance Version of the Second Resolution Amending the 2026 Miscellaneous Tax Rules (RMF) on its official website.
Unlike several previous advance versions, this update includes substantive amendments with broader implications, particularly in two areas:
- The income tax treatment applicable to foreign players participating in the 2026 FIFA World Cup; and
- The updated IEPS diesel tax incentive.
Rule 9.4.4 — Income Tax Applicable to Foreign Players
The rule was amended and its third and fourth paragraphs were added to establish specific procedures for the payment of income tax by individuals who are tax residents abroad and participate as players in the 2026 FIFA World Cup.
Key Requirements
- Payment deadline: The day following the date on which the income is received.
- Payment methods: Electronic transfer, cash, credit/debit card or check.
- FIFA Member Associations: May make the payment on behalf of the player in accordance with Form 117/CFF of Annex 2.
Rule 11.7.3 — Diesel Base Price
Sections XIV through XXIII were added to establish the applicable per-liter deductions for the period from July through September 2026.
Applicable Amounts
July
- MXN 0.92, 0.88 and 0.89 per liter.
August
- MXN 0.89, 0.92 and 0.94 per liter.
September
- MXN 0.95 per liter as of September 3.
- MXN 0.96 per liter as of September 10.
Effective Date
The amendments become effective the day following their publication in the Official Gazette (DOF).
SAT — Operations & Transparency
Mobile Office: 16,200 Procedures Completed in One Week
During the week of September 7–11, SAT’s Mobile Office visited 35 municipalities across 24 states, serving approximately 7,800 individuals and completing 16,200 procedures.
Without requiring a prior appointment, taxpayers were able to access services including:
- RFC registration;
- Generation and renewal of the e.firma;
- Issuance of the Tax Status Certificate (Constancia de Situación Fiscal — CSF); and
- General tax guidance.
Municipalities Visited
35 municipalities across 24 states.
Individuals Served
Approximately 7,800 taxpayers without a prior appointment.
Procedures Completed
16,200 procedures during five days of operation.
High Service Availability
Expanded availability for in-person taxpayer services during the week.
SAT Clarification Regarding Tax Losses
SAT also issued Information Bulletin No. 12, denying a report published by Reforma stating that the government intended to impose a 3% tax on sales involving tax losses.
SAT clarified that the proposed mechanism would apply only to companies that determine taxable income for the relevant fiscal year.
CHAPTER 3 — Ministry of Economy / ANAM
Customs & Economic Developments
Regulation of the Quality Infrastructure Law
Published in the Official Gazette (DOF) on September 4, 2026, the new regulation modernizes Mexico’s regulatory framework for:
- Standardization;
- Conformity assessment;
- Verification; and
- Metrology.
It also strengthens the PLATIICA platform and facilitates coordination among authorities participating in Mexico’s National Quality Infrastructure System.
The framework is aligned with Plan México and its objective of strengthening Mexico’s participation in global value chains.
ANAM Guidance — Commercial NOM Compliance
Following the amendment to Article 158 of the Customs Law, published in the DOF on November 19, 2025, ANAM issued interpretative guidance concerning compliance with commercial Mexican Official Standards (NOMs).
Where customs authorities identify non-compliance with applicable commercial NOM requirements:
- Precautionary seizure of the merchandise may apply.
- If compliance is not demonstrated within 30 days, the merchandise may become property of the federal government.
- Where compliance is subsequently demonstrated but previously omitted or inaccurate information is identified, a penalty ranging from 2% to 10% of the commercial value may apply.
Business Impact
Companies engaged in imports should review the interaction between customs declarations, product labeling, commercial NOM requirements and supporting documentation, particularly for high-volume or regulated products.
Final Award — Vulcan Materials Case (ICSID)
The Government of Mexico reported that the final award in the Vulcan Materials / Legacy Vulcan LLC case is publicly available through the International Centre for Settlement of Investment Disputes (ICSID).
According to the Mexican Government, of the measures challenged by Legacy Vulcan LLC, only one was determined to be inconsistent with NAFTA.
The amount awarded represents less than 1% of the amount originally claimed.
Mexico has reaffirmed its position regarding national sovereignty while maintaining that dialogue with the company remains open within the applicable legal framework.
CHAPTER 4 — PRODECON
PRODECON 4.0: Fifteen Years of Evolution Toward Tax Justice
The Procuraduría de la Defensa del Contribuyente (PRODECON) marks 15 years of effective operations with a transformation that is not primarily technological, but fundamentally human.
Under PRODECON 4.0, the institution places vulnerable taxpayers at the center of its mission, seeking to remove barriers so that taxpayers can exercise their rights regardless of their location, economic circumstances or level of tax knowledge.
2004–2011 — Establishment
Following the 2004 Tax Reform, the institution was formally developed and began creating new procedures and establishing the institutional credibility required to engage in dialogue with SAT.
2011–2017 — Institutional Positioning
Through taxpayer complaints, substantive criteria and greater technical visibility, PRODECON consolidated its role as a meaningful avenue for taxpayer protection.
2017–2022 — Conclusive Agreements
The Conclusive Agreement mechanism became one of PRODECON’s most significant tools, providing greater tax certainty, reducing litigation and strengthening the legal-tax relationship between taxpayers and the authorities.
2022–2026 — PRODECON 4.0
A renewed mission focused on bringing tax justice closer to those who need it most through in-person, digital and specialized services.
After fifteen years, PRODECON’s greatest innovation remains the same: standing on the side of taxpayers.
Conclusive Agreements: A Consensus-Based Mechanism to Resolve Tax Disputes
Conclusive Agreements are an alternative dispute-resolution mechanism available during tax audit procedures and are governed by Articles 69-C and following of the Federal Tax Code (CFF), effective since January 1, 2014.
They are not private contracts, nor do they constitute a negotiation regarding whether a tax liability exists or must be paid, as such a negotiation would conflict with the principle of statutory tax authority.
Instead, they constitute a public-law procedural agreement.
The process is based on consensus, but that consensus operates within the legal parameters established by law. PRODECON convenes the parties, facilitates the working sessions and verifies that the outcome respects the taxpayer’s rights.
If the parties cannot reach common ground, no agreement is concluded.
Key Benefits
- Reduce tax litigation and provide greater certainty regarding tax assessments.
- Strengthen the legal and tax relationship between taxpayers and the authorities.
- Derive their effectiveness from the parties’ mutual consent and the legal effect expressly granted to the agreement.
CHAPTER 5 — STPS / IMSS / SCJN
Employment, Social Security & Courts: Significant Government Data and Judicial Developments
Formal Employment — Historic High
As of the end of August 2026, the number of jobs registered with IMSS reached 22,798,473, representing the highest employment level ever recorded for an August.
Permanent positions reached 19,860,128, an absolute record for any month.
Annual employment growth stood at 1.5%.
Minimum Wage — 13% Increase in 2026
The general minimum wage reached MXN $315.04 per day, while the Northern Border Free Zone minimum wage reached MXN $440.87 per day.
Since 2018, purchasing power has increased by approximately 154%.
The increase directly benefited approximately 8.5 million workers registered with IMSS.
Simplified REPSE Process for Micro and Small Businesses
The Ministry of Labor and Social Welfare (STPS) is reducing the REPSE registration process from eight procedures to one, while reducing the expected response time from 20 to five business days.
Approximately 18,000 economic units with up to 10 employees are expected to benefit.
The simplified process leverages information already available through SAT, IMSS and INFONAVIT.
Business Impact
For companies operating within Mexico’s outsourcing and specialized-services framework, the simplification should reduce administrative burdens while increasing the importance of ensuring that information maintained across SAT, IMSS and INFONAVIT is accurate and consistent.
Digital Employer Identification Card (TIP)
IMSS approved Agreement ACDO.AS2.HCT.310826/238, establishing the mandatory generation of the Digital Employer Identification Card (TIP Digital) through the IMSS Electronic Mailbox (Buzón IMSS).
The digital document replaces the physical card.
Effective Date
The requirement becomes effective 15 calendar days after publication in the Official Gazette, which occurred on September 8, 2026.
Supreme Court of Justice — Two High-Impact Tax & Labor Criteria
📌 AFORE Beneficiaries — Income Tax Exemption
In Conflict of Criteria 49/2026, decided during the Supreme Court plenary session on September 9, 2026, the Supreme Court determined that funds held in individual retirement accounts under the Retirement Savings System (SAR) and distributed to beneficiaries of deceased workers constitute income exempt from income tax.
The Court considered these funds materially comparable to a legacy for tax purposes.
The formal distinction between a civil succession mechanism and a social security mechanism is not sufficient to deny the exemption because both arrangements produce substantially similar economic and legal consequences.
Potential Business / Tax Impact
The decision may be relevant when reviewing the tax treatment of retirement account distributions received by beneficiaries and should be considered in applicable tax advisory and litigation positions.
📌 Tax Guarantee Requirement for Suspension — Constitutional
In Amparo Review 236/2026, the Supreme Court’s Plenary upheld the constitutionality of Article 28, Section II, subsection a), of the Federal Administrative Litigation Law (LFPCA).
The provision requires taxpayers to guarantee the tax liability in order for a suspension of the enforcement of a tax assessment to become effective.
The Court determined that the different treatment applicable to official government entities is constitutionally valid because such entities act in the exercise of public powers rather than as private parties.
Accordingly, there is no valid legal comparison between the two situations.
Labor Jurisprudence — Registry 2032614
Mandatory application beginning September 17, 2026
A Regional Plenary Court for Criminal and Labor Matters established binding jurisprudence regarding the good-faith nature of a job offer and the reversal of the burden of proof.
When determining whether an employer’s job offer was made in good faith, courts should not consider evidence concerning whether the dismissal actually occurred.
That evidence belongs to the merits of the labor proceeding rather than to the preliminary determination of whether the job offer qualifies as a good-faith offer.
The precedent becomes mandatory as of September 17, 2026.
CHAPTER 6 — ABM / IMCP
Technical Alerts: Financial Malware & Accounting Implications of the 2027 Economic Package
🔐 ABM & CONDUSEF — Preventive Financial Malware Alert
The Mexican Association of Banks (ABM) warned about financial fraud involving malicious software capable of:
- Capturing banking credentials;
- Intercepting authentication codes; and
- Obtaining remote control of electronic devices.
A critical point for organizations and individuals is that the fraud does not necessarily originate within the banking application itself.
It may begin through fraudulent:
- SMS messages;
- Emails; or
- Links.
Recommended Controls
- Install and regularly update antivirus and anti-malware software.
- Download applications exclusively from official app stores.
- Never share passwords, PINs or verification codes.
- Confirm the amount, beneficiary and destination account before authorizing transactions.
- Activate transaction alerts to identify unauthorized activity promptly.
📊 IMCP / CINIF — Accounting Implications of the 2027 Economic Package
Professional accounting organizations have identified three significant areas requiring attention when preparing financial statements.
NIF D-4 — Deferred Income Taxes
The proposal to limit the annual utilization of tax losses to 50% would require companies to reassess the recoverability of deferred tax assets and perform more rigorous impairment analyses over an extended 20-year period.
Effective Tax Rate
The proposed 0.9900 / 0.9667 factors applicable to certain operating expenses would generate a permanently non-deductible component, potentially increasing the effective tax rate relative to pre-tax accounting income.
Beneficial Ownership — Article 32-B Quáter of the CFF
IMCP reiterates the importance of maintaining current documentation regarding:
- Ultimate ownership;
- Board of Directors composition; and
- Shareholding structures.
Outdated beneficial ownership files could result in significant penalties during SAT reviews or in connection with transactions requiring notarial intervention.
Executive Summary
Priority Actions for This Week
Based on the developments observed during September 7–12, 2026, the following actions should receive priority from corporate tax, compliance, customs and finance teams:
1. Review CFDI Cancellation Processes
The proposed requirement to cancel CFDIs within the same month of issuance represents one of the most significant operational changes included in the 2027 Economic Package.
Companies should evaluate their internal invoicing, approval and cancellation workflows before the October 20 legislative milestone.
2. Assess the Proposed Legal Framework for AI-Driven Tax Enforcement
The proposed codification of AI within SAT’s enforcement powers would further strengthen technology-driven tax administration.
Tax teams should assess the potential impact on:
- Tax audit strategies;
- Data governance;
- Documentation standards;
- Internal controls; and
- Tax controversy and defense strategies.
The trend toward data-driven and technology-enabled enforcement is becoming increasingly evident.
3. Update Beneficial Ownership Files
The requirements under Article 32-B Quáter of the Federal Tax Code require ongoing attention.
Companies should ensure that documentation regarding their beneficial owners, Board of Directors and shareholding structure is fully current.
Any discrepancy identified during a SAT review or notarial process could result in significant penalties.
4. Implement the Digital TIP and Review REPSE Simplification
The Digital Employer Identification Card (TIP Digital) is now mandatory through the IMSS Electronic Mailbox.
At the same time, micro and small businesses subject to REPSE should begin transitioning to the new simplified process.
5. Assess the Accounting Impact of the 2027 Economic Package — NIF D-4
Finance and tax teams should work closely with auditors to reassess:
- Recoverability and impairment testing of deferred tax assets;
- The potential impact of the proposed tax-loss utilization limitation; and
- Additional disclosures regarding effective tax rate reconciliations.
Executive Perspective
The developments observed during the week of September 7–12, 2026 reinforce a significant trend in Mexico’s tax and regulatory environment: tax enforcement is becoming increasingly technology-driven, data-centric and real-time.
The proposed 2027 Economic Package does not introduce new structural taxes, but it represents a meaningful expansion of the government’s ability to leverage data, artificial intelligence and integrated information systems to identify tax risks and strengthen enforcement.
For multinational organizations, this evolution has implications well beyond traditional tax compliance.
Corporate tax functions should increasingly operate in close coordination with Finance, Accounts Payable, Procurement, IT, Customs, Legal, HR and Internal Controls to ensure that the information submitted to Mexican authorities is consistent, timely and fully supported.
Particular attention should be given to CFDI governance, supplier due diligence, beneficial ownership documentation, customs compliance, social security obligations and the accounting consequences of proposed tax reforms.
Organizations that strengthen these governance mechanisms before the new rules take effect will be better positioned to mitigate audit exposure, preserve tax certainty, protect supply-chain continuity and respond effectively to increasingly data-driven tax authority reviews.
Next Key Legislative Date
October 20, 2026 — Expected Chamber of Deputies vote on the 2027 Federal Revenue Law and related tax package.